Carbon-arsenic bond cleavage by a newly isolated Gram-negative bacterium, strain ASV2

Article Abstract:

A study of the carbon-arsenic bond break by a strain ASV2, a newly isolated gram-negative bacteria, reveals that the bacterium uses arsonoacetate as the only source of carbon and energy, accompanied by extracellular release of arsenate. Resting-cell studies reveal that the cleavage of carbon-arsenic bond occurs in the presence of arsonoacetate and has restricted substrate specificity. Arsonoacetate-metabolizing cells also exhibit an arsenite-oxidizing activity, indicating that arsenite may be the inorganic product of the reaction.

Analysis, Biodegradation, Scission (Chemistry)

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Starvation yields a drastic decrease in outer-membrane permeability to a periplasmic foreign protein in Myxococcus xanthus

Article Abstract:

A decrease in the permeability of the outer membrane of the scavenging bacteria Myxococcus xanthus inhibits the movement of acid phosphatase (AppA) protein out of the cell. The decrease in permeability is due to changes in the fatty acid content of the membrane. Starvation decreases the synthesis of the two foreign proteins, AppA protein and beta-galactosidase. The two events are simultaneous but unrelated. Protein secretion during starvation involves a different pathway compared to the normal growth pathway.

Health aspects, Physiological aspects, Biological transport, Membranes (Biology), Myxobacterales, Bacterial proteins, Myxobacteria

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Metabolism of sulfoacetate by environmental Aureobacterium sp and Comamonas acidovorans isolates

Article Abstract:

A study was conducted on the utilization of sulfoacetate as sole carbon and energy source by newly isolated gram-positive and gram-negative environmental bacterial strains. The findings indicate that sulfoacetate mineralization in both isolates may occur via a novel pathway which involves an initial reduction to sulfoacetaldehyde and cleavage of the C-S bond to form sulfite and acetate.

Microbial metabolism, Oxidases, Microbial enzymes, Acetaldehyde

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